Chock.



PATENTBD APR. 9, 190'?.`

J. M. THOMAS.

' CHOCK.

unicum! Hmm AUG. 2a, laos.

y Witness@ Y U NTTED STATES JAMES MADISON THOMAS, OF TALIiADEGA,ALABAMA.

CHOCK.

Specification of Letters Patent.

Patented April 9, 1907.

Application filed August 28,1908. Serial No. 332.355.

' 1' o all whom it may concern:

Be it known that I, JAMES MADISON THOMAS, a citizen of the UnitedStates, re-

siding at Talladega, in the county of Talla- Y different diameters, andwill constitute an effective chock which can be readily moved to anoperative or to an inoperative position.

The v\1'r-erred form of construction is illustrated in the accompanyingdrawings, where- Figure lY is a perspective view of a rear ortion of avehicle, showing the chock applied thereto. Fig. 2 is a side view of aportion of one of the arms. Fig. 3 is a sectional view on the line 3 3of Fig. 2.

Similar numerals of reference designate corresponding parts in all thefigures of the drawin s.

In t e embodiment illustrated a rockshaft 4 is employed, which isarranged to be onrnaled u on the rear ortion of a vehicle.

o this en spaced boxmgs 5 are arranged upon the shaft and are providedwith ears 6, having offset terminals 7, ada ted to bc fastened to thevehicle. In or er to prevent longitudinal movement of the rock-shaft 4in the bcxings, collars 8 are preferably employed, which collars aresecured to .the shaft by set-screws 9.

Arms are mounted on the ends of the rock- Y shafts and constitutesupports for the chocking devices. 4s

These arms consist of slidablyassociated sections 10 and 11, thesections 10 having hubs 12 secured *.0 the shaft by setscrews 13. Thesections 10, furthermore, have offset terminals 14, through which areformed openings 15, and other openings 16 are also provided in the armsbetween the offset terminals and the hubs. The sections 11 arepreferably in the form of rods that pass through the openings 15in theoffset terminals 14, these rods having offset terminals 17, that engagein the openings 16. Eyebolts 18, surrounding the rods, are alsoadjustable in the openings 16 and serve to hold the sections l() and 11against detachment, as will be evident by reference to Fig. 3. Thesections 11, furthermore, are provided between their ends with coils 19,and their outer ends are ofi set, as shown at 20, to providejournal-pins on .which are` rotatably mounted chock-blocks 21, held inplaceby nuts 22. The section 10 of one of the arms constitutes one armof a bell-crank lever, the other arm of said lever being designated .23and constituting a part of the actuating means for the chock. Thus inthe present embodiment a quadrant-rack 24 is secured to the vehicle, anda lever 25, coperating with this rack, has a link connection .26 withthe arm 23. suitable actuating mechanism may be sub stituted for this lever and the parts associated therewith.

In applying the chock to a vehicle the journal-boxes 5 are secured tothe rear axle or the part of the vehicle running-gear that isconveniently located with relation to the rear wheels. The sections 10and 11 of the arms are then adjusted so that the chock-blocks 21 willproperly engage the roadway just in rear of the wheels. It willtherefore be evident that if the lever 25 is moved forwardl the blocks21 will be elevated and the chockY will be in inoperative position. If,however, the lever 25 is swung rearwardly, the chock-blocks will bemoved to operative positions in rear of and beneath the wheels. Theyielding construction of the arms formed b the coils 19 insures theroper coaction o said chockblocks with t e wheels and roadway.

It will be clear that the construction is ve simple, is readilyapplicable to any welknown make of vehicle, and experience hasdemonstrated that it will constitute an effect-l ive chock to preventretrograde movement of the wagon.

From the foregoing it is thought that the construction, operatlon, andman advantages. of the herein-described invention will be apparent tothose skilled in the art Without further description, and it will beunderstood that various changes in the size, shape, pro portion, andminor details of construction may be resorted to without departing fromthe spirit or sacriicing any of the advantages of the invention.

Having thus described my invention, what It will be understood that anyIOO Ilo

Y laterally yieldable, means connected to the other section for Swinginthe arm, and a chock carried by the yielda le section.

2. The combination with a s i g arm comprisin slidably-associatedsections, and means for olding the sections against sliding movement, ofmeans connected to the inner section for ivotally mounting and. swingingJ the arm, t e other section being laterally yieldable, and a chockcarried bythe outer end of the yieldable section.

3. The v combination with a ivotallymounted arm-section havin an o setterminal, of another arm-section s idably mounted in the offset terminaland having an offset terminal that adjustably interlocks with thefirst-mentioned arm-section, means for maintaining said interlockingengagement and holding said sections against sliding movement, a chockcarried by the outer end of the slidable section, and means for swingingthe sections. f

4. The combination with a rock-shaft, of means for mounting the salme ona vehicle, means for operatin the rock-shaft, laterallyyieldablearm-sections adjustably mounted on the rock-shaft and havingintermediate coiled s ring portions, and chock-blocks mounted on theouter ends of the adjustable yielding-arm sections.

' 5. T 1c combination with a rock-shaft, of journahboxes for said shaft,means for securing the journal-boxes to a vehicle, arma carried by therock-shaft and com ,n risi I slidabl associated sections, means forliiilding t e sections against their sliding movements, one

of the sections of each arm having a coiled portion and an oifsetterminal, chock-blocks mounted on said offset terminals, one of the armshaving a section that consists of a bellcrank lever, and actuating meansfor the chock connected to said bell-crank lever.

In testimony that I claim the foregoing as my own I have hereto affixedmy signature in the presence of two witnesses.

y JAMES MADIsoN THOMAS.. Witnesses: -h

J. A. THORNTON, W. C. DownELL.

